diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 063ac0f..36c315a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,23 +9,15 @@ env:
   RUSTFLAGS: -Dwarnings
 
 jobs:
-  check:
-    name: Check
+  check-msrv:
+    name: Check MSRV
     runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        rust:
-          - stable
-          - 1.77.1
     steps:
       - name: Checkout sources
         uses: actions/checkout@v3
 
       - name: Install toolchain
-        uses: dtolnay/rust-toolchain@master
-        with:
-          toolchain: ${{ matrix.rust }}
+        uses: dtolnay/rust-toolchain@1.64.0
 
       - name: Run cargo check
         run: cargo check
diff --git a/.github/workflows/loom.yml b/.github/workflows/loom.yml
index 1f88b1b..3cd8f2b 100644
--- a/.github/workflows/loom.yml
+++ b/.github/workflows/loom.yml
@@ -1,7 +1,9 @@
 name: Loom
 
 on:
-  workflow_dispatch:
+    pull_request:
+    push:
+      branches: [ main ]
 
 jobs:
   loom:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ee080aa..7b0e92f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# [Unreleased]
+* Add `unexpected_cfgs` flag in `Cargo.toml` and accordingly decrease MSRV to
+  1.64 (???).
+
 # 0.2.0 (2024-05-15)
 
 * Make it possible to specify a deadline when waiting for an event ([#1]).
diff --git a/Cargo.toml b/Cargo.toml
index 7fc0d85..cd8277c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,7 +8,7 @@ name = "async-event"
 version = "0.2.0"
 authors = ["Serge Barral <serge.barral@asynchronics.com>"]
 edition = "2021"
-rust-version = "1.77"
+rust-version = "1.64"
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/asynchronics/async-event"
 readme = "README.md"
@@ -22,11 +22,14 @@ keywords = ["async", "event", "atomic", "futures"]
 pin-project-lite = "0.2"
 
 [dev-dependencies]
-tokio = { version = "1", features = ["full"] }
+tokio = { version = "1.0", features = ["full"] }
 futures-executor = "0.3"
 
 [target.'cfg(async_event_loom)'.dependencies]
 loom = "0.5"
 
 [target.'cfg(async_event_loom)'.dev-dependencies]
-waker-fn = "1.1"
\ No newline at end of file
+waker-fn = "1.1"
+
+[lints.rust]
+unexpected_cfgs = { level = "warn", check-cfg = ['cfg(async_event_loom)'] }
diff --git a/src/lib.rs b/src/lib.rs
index 695e8e8..6b1d2a5 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -68,13 +68,6 @@
 //!      assert_eq!(v, 42);
 //! });
 //! ```
-
-// Temporary workaround until the `async_event_loom` flag can be whitelisted
-// without a `build.rs` [1].
-//
-// [1]: (https://github.com/rust-lang/rust/issues/124800).
-#![allow(unexpected_cfgs)]
-
 mod loom_exports;
 
 use std::future::Future;
@@ -1141,6 +1134,7 @@ mod tests {
     /// When the future is still in a `Polled` state, this future is moved into
     /// the enum so as to extend its lifetime and allow it to be further
     /// notified.
+    #[allow(dead_code)]
     enum FutureState {
         Completed,
         Polled(Pin<Box<WaitUntilClosure>>),
@@ -1371,7 +1365,7 @@ mod tests {
         loom_notify(2, 2, 1, 1, 1, true, DEFAULT_PREEMPTION_BOUND);
     }
     #[test]
-    fn loom_two_consumers_three_AVAILABLE_TOKENS() {
+    fn loom_two_consumers_three_tokens() {
         const DEFAULT_PREEMPTION_BOUND: usize = 3;
         loom_notify(3, 2, 1, 0, 0, false, DEFAULT_PREEMPTION_BOUND);
     }